I reviewed that card a month ago!: http://www.overclockers.com/sapphire-r9-380x-nitro-video-card-review/This is the card I was referring to in post #13:
http://www.guru3d.com/articles-pages/amd-radeon-r9-380x-4gb-review,1.html
I will agree with EarthDog, for 3-4 years with no upgrade you're not setting realistic goals. If that's what you want you need to spend more and get something like a 980 Ti...... even then with the new wave of HBM suppose to drop this year not exactly a move "I" would make right now. As for the 970/390 get whichever appeals to you most. For your uses you will not go wrong with either.
Good luck
Its nothing but a R9 285 for the most part... a hair faster than a 280x/7970.
I also wouldn't worry about your GPU having HBM. Where HBM shines, is at higher resolutions (think 4K/5760x1080) where that extra bandwidth is needed. If the OP is staying at 1080p, it really wont make a huge difference. A 980Ti will be plenty. Take a look at the Fury X reviews and see how it compares to the 980/980Ti. What you will see there is at 1080p, the gap is X%, but as the resolution increases, that gap shrinks.
Also, NVIDIA is reported to only have HBM2 in their high end cards, whereas the cards marketed for 1080p gaming, may have teh GDDR5X instead of the HBM, as again, that kind of memory bandwidth just isn't needed at that 1080p resolution.
